Hot Deformation Behavior and Microstructural Evolution of an Fe-Cr-W-Mo-V-C Steel
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THE steel industry is facing challenges from the increasingly high performance requirements for steel components. For instance, the harsh working conditions during cold rolling require the development of new work roll materials with better tailored microstructures and service performance.[1,2] Cold work roll, as one of the most important components of the workpieces in the cold rolling mill, requires excellent wear resistance and surface hardness to withstand large rolling forces.[3–6] To
SHANJU ZHENG is with the Faculty of Land Resource Engineering and the State Key Laboratory of Complex Nonferrous Metal Resources Clean Utilization, Kunming University of Science and Technology, Kunming 650093, China. XIAOHONG YUAN is with the GuiYan Detection Technology Co., Ltd., Kunming 650156, China and also with the Sino-Platinum Metals Co., Ltd., Kunming 650156, China. Contact email: [email protected] XING GONG is with the College of Physics and Optoelectronic Engineering, Shenzhen University, No. 3688, Nanhai Avenue, Nanshan District, Shenzhen 518060, China. Contact email: [email protected] THIQUYNHXUAN LE is with the Faculty of Metallurgical and Energy Engineering and the State Key Laboratory of Complex Nonferrous Metal Resources Clean Utilization, Kunming University of Science and Technology, Kunming 650093, China. A.V. RAVINDRA is with the State Key Laboratory of Complex Nonferrous Metal Resources Clean Utilization, Kunming University of Science and Technology, Kunming 650093, China. Manuscript submitted October 30, 2018.
METALLURGICAL AND MATERIALS TRANSACTIONS A
achieve this goal, the strong precipitate-forming elements, such as V,[7] W,[8] Mo,[8,9] and Cr,[10] have been extensively used in high-alloy steels to improve their strength and hardness. Recently, the series of Fe-Cr-WMo-V-C high-alloy steels with various compositions[5,7,11–15] have become important candidate materials to replace the traditional low-alloy steels for application in cold work roll.[11,12] However, the low-temperature workability and deformability of Fe-Cr-W-Mo-V-C steels were reported to be deteriorated by the carbide-forming elements.[13,16–19] Therefore, it is necessary to determine the optimum thermomechanical processing parameters in order to offset the negative effect of alloying the carbide-forming elements on deformability of the steels. In this sense, to understand the hot deformation behaviors is of great importance. Dynamic recrystallization (DRX) is a phenomenon involving nucleation and growth of new grains during deformation at high temperature, which is critical to determine the mechanical properties of many engineering metals such as steels,[20,21] Mg alloys,[22,23] Ti alloys,[24,25] and Ni alloys.[26,27] In principle, DRX can be used to achieve a desirable grain structure, in contrast to the traditional way in which the grain structure is properly controlled by first cold working the material and then annealing it at elevated temperatures. In this context, extensive efforts have been made to study the DRX behavior of metallic m
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